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I found this absolutely fascinating. Do the test at the end & watch
the spots disappear.
It is not a joke. Have you ever been driving along and suddenly
someone you didn't see (another car, a motorcycle/bicycle, or even a
person) is right in front of you?

And wonder "How did I miss seeing that?" Here is the answer.
US Naval Aviation Instruction confirms that NOT focusing for too long
on one thing in traffic could save a life or two...
It works exactly like it says, and is one major reason people in cars
can ‘look right at you’, when you're on a motorcycle or bicycle, AND
NOT SEE YOU.
An Instructor explains " This is a great illustration of what we were
taught about scanning outside the cockpit when we went through
training. We were always told to scan the horizon for a short
distance, stop momentarily, and repeat the process. I can remember
being told why this was the most effective technique to locate other
aircraft. It was emphasized (repeatedly) to NOT fix your gaze for more
than a couple of seconds on any single object. The instructors,
veterans with years of experience, instructed us to continually "keep
our eyes moving and our head on a swivel" because this was the best
way to survive, not only in combat, but from peacetime hazards (like a
midair collision) or road safety as well."